Optional available headers from the finest stainless steel offer an upgrade to a full system when used with the Akrapovič Slip-On exhaust system. Let your bike stand out with more power, beautiful design, and the unique Akrapovič sound.For perfect performance, throttle response and durability, ECU remapping is recommended.Optional headers fit also with Akrapovič standard (first fit) / BMW accessory Akrapovič silencer and on BMW M1000RR model. Please notice that Akrapovič first fit heatshield is not compatible with these optional headers. THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.